Forum Debian Users Gang

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>

#define EXIT_SUCCESS 0
#define EXIT_FAILURE 1

static void daemonize(void)
{
    pid_t pid, sid;

    /* already a daemon */
    if ( getppid() == 1 ) return;

    /* Fork off the parent process */
    pid = fork();
    if (pid < 0) {
        exit(EXIT_FAILURE);
    }
    /* If we got a good PID, then we can exit the parent process. */
    if (pid > 0) {
        exit(EXIT_SUCCESS);
    }

    /* At this point we are executing as the child process */

    /* Change the file mode mask */
    umask(0);

    /* Create a new SID for the child process */
    sid = setsid();
    if (sid < 0) {
        exit(EXIT_FAILURE);
    }

    /* Change the current working directory.  This prevents the current
       directory from being locked; hence not being able to remove it. */
    if ((chdir("/")) < 0) {
        exit(EXIT_FAILURE);
    }

    /* Redirect standard files to /dev/null */
    freopen( "/dev/null", "r", stdin);
    freopen( "/dev/null", "w", stdout);
    freopen( "/dev/null", "w", stderr);
}

int main( int argc, char *argv[] ) {
    daemonize();

    /* Now we are a daemon -- do the work for which we were paid */


    return 0;
}